Xref: utzoo comp.unix.i386:6559 comp.sys.ibm.pc:53690 Path: utzoo!attcan!uunet!maxed!root From: root@maxed (0000-Admin(0000)) Newsgroups: comp.unix.i386,comp.sys.ibm.pc Subject: Re: Adaptec 1542 Kernel tuning with 386/ix Message-ID: <1990Jul06.164601.8868@maxed> Date: 6 Jul 90 16:46:01 GMT References: <361@zds-ux.UUCP> <1990Jul04.123903.3204@nstar.uucp> Organization: American Micro Group, Ft. Lee NJ Lines: 47 In article pcg@cs.aber.ac.uk (Piercarlo Grandi) writes: > >In article <1990Jul04.123903.3204@nstar.uucp> larry@nstar.uucp (Larry >Snyder) writes: > > behm@zds-ux.UUCP (Brett Behm) writes: > > >I really do not know what to make of these results. >All over I see transfer rates around 300K per second. If they are thru >the filesystem it is not too bad, but I had expected better from >AHA1542, HPDD, and FFS. Something more like 500-600 KB/sec. The BYTE UNIX Benchmarks do a 'thru the filesystem' test that is more illuminating, although the variance is high. I get the following with the Adaptec AHA 1542A on a 33MHz machine running ISC 2.2: ============================================================================= Filesystem Throughput Test: ----------------------------------------------------------------------------- Test Time: 1 secs Arithmetric Geometric Variance Mean Mean (6 tests) Read (Kbytes/sec): 2617 2050 1358965.47 Write (Kbytes/sec): 280 25 433628.17 Copy (Kbytes/sec): 1004 1000 9398.17 ----------------------------------------------------------------------------- Test Time: 10 secs Arithmetric Geometric Variance Mean Mean (6 tests) Read (Kbytes/sec): 533 472 51605.47 Write (Kbytes/sec): 428 408 17707.07 Copy (Kbytes/sec): 339 336 2618.67 ----------------------------------------------------------------------------- Test Time: 20 secs Arithmetric Geometric Variance Mean Mean (6 tests) Read (Kbytes/sec): 715 714 1740.27 Write (Kbytes/sec): 505 505 164.67 Copy (Kbytes/sec): 354 354 190.17 This is for the stock 5 MHz DMA and other parameters. I guess the variance is the result of the operating system buffering, which is especially quirky on short tests. -- Ed Whittemore uunet!maxed!ed American Micro Group 201 944 3293